An Experimental Treatise on Optics: Comprehending the Leading Principles of the Science, and an Explanation of the More Important and Curious Optical Instruments and Optical Pheonomena; Being the Third Part of a Course of Natural Philosophy, Compiled for Use of the Students of the University at Cambridge, New England, Τόμος 3Hilliard and Metcalf, 1826 - 350 σελίδες |
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Σελίδα 17
... focus , which may be consider- ed as a point ; so that if it be situated before the mirror , it will give the image of the point S. This is in fact confirmed by ex- periment , as we shall presently see , but we must first determine the ...
... focus , which may be consider- ed as a point ; so that if it be situated before the mirror , it will give the image of the point S. This is in fact confirmed by ex- periment , as we shall presently see , but we must first determine the ...
Σελίδα 18
... focus F only indicates the imaginary point of meeting of these rays produced . 14. This case being resolved in a general manner , nothing is more easy than to find the place of the focus for all other pos- Fig . 12. sible situations of ...
... focus F only indicates the imaginary point of meeting of these rays produced . 14. This case being resolved in a general manner , nothing is more easy than to find the place of the focus for all other pos- Fig . 12. sible situations of ...
Σελίδα 19
... focus a plate of ground glass and look at it from behind , we shall see painted upon it a little image of the taper , very bright and moreover inverted , as we are taught to expect both from calcalation and our graphic construction . We ...
... focus a plate of ground glass and look at it from behind , we shall see painted upon it a little image of the taper , very bright and moreover inverted , as we are taught to expect both from calcalation and our graphic construction . We ...
Σελίδα 20
... focus of reflected rays may be thrown into the dark part of the room . We next place in this direction a plate of polished glass , or a piece of white pasteboard ff , which may be brought nearer or removed further from the mirror , till ...
... focus of reflected rays may be thrown into the dark part of the room . We next place in this direction a plate of polished glass , or a piece of white pasteboard ff , which may be brought nearer or removed further from the mirror , till ...
Σελίδα 21
... focus , which will be the focus of the concave mirror proposed . 18. When we wish only to verify by observation the results obtained from calculation , it is of little importance whether we use mirrors of metal or of glass . It is ...
... focus , which will be the focus of the concave mirror proposed . 18. When we wish only to verify by observation the results obtained from calculation , it is of little importance whether we use mirrors of metal or of glass . It is ...
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Άλλες εκδόσεις - Προβολή όλων
An Experimental Treatise on Optics: Comprehending the Leading Principles of ... Professor John Farrar,Jean-Baptiste Biot Δεν υπάρχει διαθέσιμη προεπισκόπηση - 2016 |
Συχνά εμφανιζόμενοι όροι και φράσεις
according achromatic angle of incidence aperture appear attractive forces axes axis beam become blue bodies calculate centre compose consequently crystal density Descartes determine deviation diameter direction dispersion divergence double refraction effect emergent ray equal experiment extraordinary extraordinary ray extreme eye-glass faces focal distance focus formed glass green heliostat homogeneous Iceland spar incident ray inclined interior lamina lens lenses light limits luminous particles luminous rays magnifying manner medium mirror Newton object object-glass oblique observed ordinary ordinary ray parallel pass perpendicular phenomena phenomenon plane plate of air polarisation portion prism produced ratio of refraction red rays refracted rays refracting power refracting telescope refrangibility render repulsive force retina rhomboid rings second surface sensation sensible simple rings sine spectrum spherical spherometer straight line substance suppose takes place telescope thickness thin tint tion transmission transmitted transparent traverse tube unequal velocity violet rays yellow
Δημοφιλή αποσπάσματα
Σελίδα 334 - The violet light was obtained in the usual manner, by means of a common prism, and was collected into a focus by a lens of a suffiOpt.
Σελίδα 305 - ... varies as the square of the cosine of the angle between the plane of transmission of the analyser and the plane of the polariser.
Σελίδα 334 - ... meridian at right angles. The focus of violet rays was carried slowly along the needle, proceeding from the centre towards one of the extremities, care being taken never to go back in the same direction, and never to touch the other half of the needle. At the end of -half an hour after the needle was exposed to the action of the violet rays, it was carefully examined, and it had acquired neither polarity nor any force of attraction ; but after continuing the operation twenty-five minutes longer,...
Σελίδα 337 - At all other angles also, when the sun's light was reflected from the surface, the color vanished with the inclination, and was equal at equal inclinations on either side. "This experiment affords a very strong confirmation of the theory. It is impossible to deduce any explanation of it from any hypothesis hitherto advanced ; and I believe it would be difficult to invent any other...
Σελίδα 337 - ... lines be placed near each other, they will facilitate the observation. If one of the lines be made to revolve round the other as an axis, the depression below the given plane will be as the sine of the inclination ; and while the eye and the luminous object remain fixed the difference of the length of the paths will vary as this sine. " The best subjects for the experiment are Mr. Coventry's exquisite micrometers; such of them as consist of parallel lines drawn on glass, at a distance of onefive-hundredth...
Σελίδα 225 - Having given the radius of an arc of any colour in the secondary rainbow, find the ratio of the sine of incidence to the sine of refraction when rays of that colour pass out of air into water.